Table 4 Test Item Sample Number and Test
ICS 77.140.50
H46
National Standards of the People’s Republic of China
GB 713 - XXXX
Superseding GB 713-1997 and GB 6654-1996
Steel plates for boilers and pressure vessels
(ISO 9328-2: 2004, Steel flat products for pressure purposes - Technical
delivery conditions - Part 2: Non-alloy and alloy steels with specified elevated
temperature properties, NEQ)
(Draft for Approval)
23/04/2007
Issue Date: XXXX – XX -XX
Implementation Date: XXXX –XX -XX
Issued by the National Standardisation Administration Committee
of the People’s Republic of China
GB 713 -XXXX
Foreword
Except the agreement provisions all other technical contents in this standard are mandatory.
This standard has been produced by non-equivalently adopting ISO 9328-2: 2004 Steel flat
products for pressure purposes – Technical delivery conditions - Part 2: Non-alloy and alloy steels
with specified elevated temperature properties and in reference with EN10028-2: 2003
Specification for flat products made of steel for pressure purposes, combining and revising GB
713-1997 Steel plates for boilers and GB 6654-1996 Steel plates for pressure vessels.
GB 713-1997 Steel plates for boilers and GB 6654-1996 Steel plates for pressure vessels will be
superseded by this standard as from its issue date.
In comparison with GB 713-1997 and GB 6654-1996 the main changes are as follows:
-
Extending the range of steel plate thicknesses and widths;
Changing the designation of standard names and codes;
Abolishing 15MnVR and 15MnVNR, and bringing in 14Cr1MoR and 12Cr2Mo1R;
Combining 20R and 20g as Q245R, combining 16MnR, 16Mng and 19Mng as Q345R and
combining 13MnNiMoNbR and 13MnNiCrMoNbg as 13MnNiMoR;
Reducing the S and P composition in all codes;
Raising the V type impact work criterion;
Abolishing the 20g and 16Mng aging impact test.
This standard was proposed by the China Iron and Steel Industry Association.
This standard is under the jurisdiction of the National Steel Standardisation Technical
Committee.
The main drafting organisations of this standard included Chongqin Iron and Steel Co. Ltd, the
Standard Research Institute of Metallurgy Industry Information, Angang Steel Co. Ltd, General
Mechanical Engineering Company of China, Wuhan Steel (Group) Co. Ltd, Jinan Steel Co. Ltd
and the China Special Equipment Institute and Research College.
The main drafters of this standard were Li Hong, Wang Xiaohu, Qin Xiaozhong, Tang Yifan, Du
Dasong, Piao Zhimin, Li Shurui and Zhang Aimin.
The standard supersedes the following previously issued versions:
-
GB 713-1963, GB 713-1972, GB 713-1986 and GB 713-1997;
GB 6654-1996.
2
GB 713 -XXXX
Steel plates for boilers and pressure vessels
1 Scope
This standard specifies the dimensions, shape, technical requirements, test methods, inspection rules, packaging,
marking and quality certification, etc. of steel plates for boilers and pressure vessels.
The standard applies to steel plates with a thickness ranging from 3 mm to 200 mm for boilers and their accessories
and pressurised components in pressure vessels at normal temperature.
2 Normative References
The provisions of the following documents become provisions of this standard after being referenced. For dated
reference documents, all later amendments (excluding corrigenda) and versions do not apply to this standard; however,
any parties that come to an agreement under this standard are encouraged to consider adopting the latest versions of
these documents. For undated reference documents, the latest versions apply to this standard.
GB/T 222 Permissible tolerances for the chemical composition of steel products
GB/T 223.3 Methods for chemical analysis of iron, steel and alloy – The diantipyryl methane phosphomolybdate
gravimetric method for the determination of phosphorus content
GB/T 223.10 Methods for chemical analysis of iron, steel and alloy – The cupferron separation-chrome azurol S
photometric method for the determination of aluminium content
GB/T 223.11 Methods for chemical analysis of iron, steel and alloy – The ammonium persulphate oxidation
volumetric method for the determination of chromium content
GB/T 223.14 Methods for chemical analysis of iron, steel and alloy – The N-benzoy-N-phenylhydroxylamine
extraction photometric method for the determination of vanadium content
GB/T 223.17 Methods for chemical analysis of iron, steel and alloy – The diantipyrylmethane photometric method for
the determination of titanium content
GB/T 223.18 Methods for chemical analysis of iron, steel and alloy – The sodium thiosulphate separation iodimetric
method for the determination of copper content
GB/T 223.23 Methods for chemical analysis of iron, steel and alloy – The dimethylglyoxime spectrophotometric
method for the determination of nickel content
GB/T 223.26 Methods for chemical analysis of iron, steel and alloy – The thiocyanate direct photometric method for
the determination of molybdenum content
GB/T 223.27 Methods for chemical analysis of iron, steel and alloy – The thiocyanate-butyl acetate extraction
spectrophotometric method for the determination of molybdenum content
GB/T 223.40 Iron, steel and alloy – Determination of niobium content by the sulphochlorophenol S
spectrophotometric method
GB/T 223.60 Methods for chemical analysis of iron, steel and alloy – The perchloric acid dehydration gravimetric
method for the determination of silicon content
GB/T 223.63 Methods for chemical analysis of iron, steel and alloy – The sodium (potassium) periodate photometric
method for the determination of manganese content
GB/T 223.68 Methods for chemical analysis of iron, steel and alloy – The potassium iodate titration method after
combustion in the pipe furnace for the determination of sulphur content
GB/T 223.69 Methods for chemical analysis of iron, steel and alloy – The gas-volumetric method after combustion in
the pipe furnace for the determination of carbon content
GB/T 223.76 Methods for chemical analysis of iron, steel and alloy – The flame atomic absorption spectrometric
method for the determination of vanadium content (GB/T 223.76-1994, eqv ISO 9647:1989)
GB/T 228 Metallic materials – Tensile testing at ambient temperature (GB/T 228-2002, eqv ISO 6892: 1998)
GB/T 229 Metallic materials – Charpy notch impact test
GB/T 232 Metallic materials – Bend test (GB/T 232-1999, eqv ISO 7438: 1985)
GB/T 247 General rules of acceptance, packaging, marking and certification for steel plates (sheets) and strips
GB/T 709 Dimensions, shape, weight and tolerances for hot-rolled steel plates and sheets
GB/T 2970 Thicker steel plates – Method for ultrasonic inspection
GB/T 2975 Steel and steel products – Location and preparation of test pieces for mechanical testing (GB/T 2975-1998,
eqv ISO 377: 1997)
GB/T 4336 Standard test method for spark discharge atomic emission spectrometric analysis of carbon and low-alloy
steel (routine method)
GB/T 4338 Metallic materials – Tensile testing at elevated temperatures (GB/T 4338-2007, ISO)
GB/T 5313 Steel plate with through-thickness characteristics (GB/T 5313-1985, eqv ISO 7778: 1983)
GB/T 6803 Standard method for conducting drop-weight tests to determine the inductility transition temperature of
ferrite steels
3
GB 713 -XXXX
GB/T 17505 Steel and steel products – general technical delivery requirements (GB/T 17505-1998, eqv ISO 404:
1992)
GB/T 20066 Steel and iron – Sampling and preparation of samples for the determination of chemical composition
YB/T 081 Rule for rounding off of numerical values and judgement of testing values for technical standards in
metallurgy
JB/T 4730.3 Non-damaging test for equipment under pressure
3 Order Content
Order contracts or order forms produced in line with this standard must include the following contents:
a) Standard serial number;
b) Name of the product;
c) Code;
d) Dimensions;
e) Delivery condition;
f) Weight;
g) Special technical requirements (such as ultrasonic testing, improving impact properties).
4 Formation of Code
Carbon steel and low alloy and high strength steel are coded with their yielding strength and the initials Q for yielding
and R for vessel in the Chinese spelling, for example Q245R.
Molybdenum steel and chromium-molybdenum steel are coded with the average carbon content and the initials of the
alloy element and R for vessel in the Chinese spelling, for example 15CrMoR.
5 Dimensions, shape, weight and tolerance
5.1 The dimensions, shape, weight and tolerance of the steel plates should meet the requirements of GB/T 709.
5.2 The thickness tolerance should conform to the B category tolerance of GB/T 709. According to the buyer’s
requirements and the agreement between the buyer and the seller, steel plates with a reduced lower tolerance on
the same tolerance can be supplied.
5.3 The steel plates are delivered in their theoretical weight. The thickness used for the theoretical weight calculation
is the average thickness of the maximum allowed thickness and the minimum allowed thickness of the steel
plates. The density of steel plates is taken as 7.85 g/cm3.
6 Technical requirements
6.1 Code and chemical composition
6.1.1
The code and chemical composition (melting analysis) of the steel plates should conform to the requirements
in Table 1.
6.1.1.1 The carbon upper limit can be raised to 0.22% for Q345R steel plates with a thickness greater than 60 mm.
6.1.1.2 The residue of chrome, nickel and copper is less than 0.30% each, the residue of molybdenum is less than
0.080% and the total content of these elements is less than 0.70% with the seller’s guarantee without the need
for further analysis.
6.1.1.3 Small traces of niobium, vanadium and titanium are permissible in Q245R, Q345R and Q370R steel, the
content of them should be listed in the quality certificate and the total amount of the above mentioned 3
elements should not exceed 0.05%, 0.10% and 0.12% respectively.
6.1.1.4 The P content can be ≤ 0.015% and the S content can be ≤ 0.005% for Q345R and Q370R steel, and the P
content can be ≤ 0.012% for 14Cr1MoR and 12Cr2Mo1R steel according to the buyer’s requirements and the
agreement between the buyer and the seller.
6.1.1.5 According to the buyer’s requirements and the agreement between the buyer and the seller the carbon
equivalent can be specified for Q245R, Q345R and Q370R steel with a value agreed by both sides. The
carbon equivalent is calculated by the formula (1):
CE (%) = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15 .............. (1)
6.1.1.6 The Alt content can be determined by measuring the acid dissolved aluminium and the Als content for the test
should not be lower than 0.015%.
6.1.2
The permitted variations in the chemical content of the finished steel plates should conform to the
requirements of GB/T 222.
4
GB 713 -XXXX
6.2 Manufacturing methods
6.2.1
The steel is smelted using an oxygen converter or electric furnace.
6.2.2
The compression ratio of the continuous casting pre-form is no less than 3.
6.3 Delivery conditions
6.3.1
The delivery conditions of steel plates should conform to the requirements in Table 2.
6.3.2
The tempering temperature for 18MnMoNbR, 13MnNiMoR, 15CrMoR and 14Cr1MoR steel should be no
lower than 620ºC; the tempering temperature for 12Cr2Mo1R and 12Cr1MoVR steel should be no lower than
680ºC.
6.3.3
Subject to agreement by both sides, 18MnMoNbR, 13MnNiMoR, 15CrMoR, 14Cr1MoR, 12Cr2Mo1R and
12Cr1MoVR steel plates with a thickness greater than 60 mm can be delivered either annealed or tempered.
The test samples of these coded steel plates should be heat-treated under delivery conditions according to
Table 2 and their performance should meet the requirements of Table 2. The size of the samples should be no
less than 3a X a X 3a (a is the thickness of the plate).
6.3.4
Subject to agreement by both sides, chrome molybdenum steel plates can be delivered having undergone
speeded-up tempering after normalisation.
6.3.5
The steel plates should be delivered with shear-cut or flame-cut edges. Where the available equipment
imposes limitations, steel plates may be delivered with raw edges if this has been agreed by both sides and
noted in the contract.
6.4 Mechanics and process performance
6.4.1
The results of the tensile test, Charpy (V-type notch) impact test and bending test should conform to the
requirements of Table 2. Steel plates with a thickness greater than 60 mm can be exempted from the bending
test requirement, if this has been agreed by both sides and noted in the contract.
6.4.1.1 According to the buyer’s requirements and the agreement between the buyer and seller, an impact test at
-20ºC can replace the impact test at 0ºC in Table 2 and its impact value should meet the requirements of
Table 2.
6.4.1.2 The value of the Charpy (V-type notch) impact test is taken from the average of three samples and one value
from the three samples may be lower than the value specified in Table 2 but no lower than 70% of said value.
6.4.1.3 The auxiliary test sample should be used for steel plates with a thickness of less than 12 mm during the
Charpy (V-type notch) impact test. The size of the auxiliary sample is 10 mm X 7.5 mm X 55 mm for steel
plates with a thickness of >8 mm to 16-36
Q245R
400-520
235
25
390-510
205
>100-150
380-500
185
3-16
510-640
345
>16-36
500-630
325
>36-60
490-620
315
>60-100
490-620
305
>100-150
480-610
285
>150-200
470-600
265
Normalisation
>16-36
>36-60
30-60
18MnMoNbR
d=2a
21
520-620
570-720
30-100
13MnNiMoR
>100-150
6-60
14Cr1MoR
12Cr2Mo1R
12Cr1MoVR
a
Normalisation
plus
Tempering
d=3a
20
d=2a
20
-20
34
d=3a
340
400
17
390
570-720
34
370
360
>60-100
15CrMoR
d=2a
0
530-630
31
24
Q345R
Q370R
180º
d=2a
d=1.5a
0
225
>60-100
10-16
V-Type
Impact
Work
AKV, J
no less
than
245
>36-60
Heat Rolling,
Controlled
Rolling or
Normalisation
Bending
Test
Impact Test
390
0
41
d=3a
18
0
41
d=3a
19
20
31
d=3a
34
d=3a
380
450-590
>60-100
295
275
>100-150
440-580
255
6-100
520-680
310
>100-150
510-670
300
6-150
520-680
310
6-60
440-590
245
>60-100
430-580
235
19
20
19
20
34
d=3a
19
20
34
d=3a
– The yielding strength can be Rp0.2, if the yielding is not noticeable.
7
GB 713 -XXXX
Table 3 – High Temperature Mechanical Performance
Test Temperature ºC
Code
Thickness
mm
200
250
300
350
400
450
500
Yielding Strength aReL or Rp0.2, N/mm2, not less than
>20-36
186
167
153
139
129
121
>36-60
178
161
147
133
123
116
Q245R
Q345R
Q370R
18MnMoNbR
13MnNiMoR
15CrMoR
>60-100
164
147
135
123
113
106
>100-150
150
135
120
110
105
95
>20-36
255
235
215
200
190
180
>36-60
240
220
200
185
175
165
>60-100
225
205
185
175
165
155
>100-150
220
200
180
170
160
150
>150-200
215
195
175
165
155
145
>20-36
290
275
260
245
230
>36-60
280
270
255
240
225
30-60
360
355
350
340
310
275
>60-100
355
350
345
335
305
270
30-100
355
350
345
335
305
>100-150
345
340
335
325
300
>20-60
240
225
210
200
189
179
174
>60-100
220
210
196
186
176
167
162
>100-150
210
199
185
175
165
156
150
14Cr1MoR
>20-150
255
245
230
220
210
195
176
12Cr2Mo1R
>20-150
260
255
250
245
240
230
215
12Cr1MoVR
>20-100
200
190
176
167
157
150
142
a
– The yielding strength can take Rp0.2, if the yielding is not noticeable.
7
Test Method
7.1 The test items, sample numbers, sampling methods and test methods for each batch of steel plate
should conform to the requirements of Table 4.
Table 4 – Test Item, Sample Number and Test Method
Sampling
Direction
Serial Number
Test Item
Sample Number
Sampling Method
1
Chemical Content
1 per furnace
GB/T 20066
2
Tensile Test
1
GB/T 2975
3
Z Direction
Tensile
3
GB/T 5313
4
Bending Test
1
GB/T 2975
Transverse
GB/T 232
5
Impact Test
3
GB/T 2975
Transverse
GB/T 229
6
High Temperature
Tensile
1 per furnace
GB/T 2975
Transverse
GB/T 4338
7
Drop-weight Test
GB/T 6803
8
Ultrasonic Test
Each Sheet
9
Dimension, Shape
Each Sheet
10
Furnace
Each Sheet
Test Method
GB/T 223 or
GB/T 4336
Transverse
GB/T 228
GB/T 5313
GB/T 6803
GB/T 2970 or
JB/T 4730.3
Measuring
instrument with
required accuracy
Visual Check
8
GB 713 -XXXX
8. Inspection Rules
8.1 The quality of steel plates should be inspected and accepted by the quality control department of
the supplier.
8.2 The steel plates should be inspected in batches. Each batch is made up of steel plates with the
same code, from the same furnace, with the same thickness, produced using the same rolling or
heat treatment method and the weight of each batch is less than 30 tons.
Steel plate factories with a long, stable production quality history after submitting the application
with the final product inspection data, and having been approved by the national special
equipment safety inspection and supervision authority, can deliver goods according to the
approved batch extension.
8.3 According to the buyer’s requirements and the agreement between the buyer and the seller the
mechanical performance test on the pre-forming rolling can be carried out on steel plates with a
thickness greater than 16 mm.
8.4 The sampling position for the mechanical performance test is taken according to GB/T 2975. The
axis of the impact test sample should be at a quarter of the plate’s thickness. According to the
buyer’s requirements and the agreement between the buyer and the seller the axis of the impact
test sample may be at half of the plate’s thickness.
8.5 If the Charpy (V-type notch) test result does not meet the requirements of 6.4.1.2, another three
samples from the same steel plate (or the same pre-formed product) could be taken for a repeat
test. The average value of these six samples from the first and second groups should be no lower
than the specified value but two of them may be lower than the specified value on condition that
only one of these two is 70% lower than the specified value.
8.6 Other repeat tests and their method of determination are carried out according to the relevant
provisions of GB/T 17505.
9
Packaging, Marking and Quality Certification
The packaging, marking and quality certification of steel plates should conform to the
requirements of GB/T 247.
9
GB 713 -XXXX
Appendix A
(Information appendix)
Code Correlation Table of New and Old Standards
The code correlation between GB 713-200X with GB 713-1997 and GB 6654-1996
(including corrigenda Nos 1 and 2) is as follows:
GB 713-200X
Q245R
Q345R
Q370R
18MnMoNbR
13MnNiMoR
15CrMoR
12Cr1MoVR
14Cr1MoR
12Cr2Mo1R
GB 713-1997
20g
16Mng, 19Mng
13MnNiCrMoNbg
15CrMog
12Cr1MoVg
GB 6654-1996
20R
16MnR
15MnNbR
18MnMoNbR
13MnNiMoNbR
15CrMoR
10
H46
National Standards of the People’s Republic of China
GB 713 - XXXX
Superseding GB 713-1997 and GB 6654-1996
Steel plates for boilers and pressure vessels
(ISO 9328-2: 2004, Steel flat products for pressure purposes - Technical
delivery conditions - Part 2: Non-alloy and alloy steels with specified elevated
temperature properties, NEQ)
(Draft for Approval)
23/04/2007
Issue Date: XXXX – XX -XX
Implementation Date: XXXX –XX -XX
Issued by the National Standardisation Administration Committee
of the People’s Republic of China
GB 713 -XXXX
Foreword
Except the agreement provisions all other technical contents in this standard are mandatory.
This standard has been produced by non-equivalently adopting ISO 9328-2: 2004 Steel flat
products for pressure purposes – Technical delivery conditions - Part 2: Non-alloy and alloy steels
with specified elevated temperature properties and in reference with EN10028-2: 2003
Specification for flat products made of steel for pressure purposes, combining and revising GB
713-1997 Steel plates for boilers and GB 6654-1996 Steel plates for pressure vessels.
GB 713-1997 Steel plates for boilers and GB 6654-1996 Steel plates for pressure vessels will be
superseded by this standard as from its issue date.
In comparison with GB 713-1997 and GB 6654-1996 the main changes are as follows:
-
Extending the range of steel plate thicknesses and widths;
Changing the designation of standard names and codes;
Abolishing 15MnVR and 15MnVNR, and bringing in 14Cr1MoR and 12Cr2Mo1R;
Combining 20R and 20g as Q245R, combining 16MnR, 16Mng and 19Mng as Q345R and
combining 13MnNiMoNbR and 13MnNiCrMoNbg as 13MnNiMoR;
Reducing the S and P composition in all codes;
Raising the V type impact work criterion;
Abolishing the 20g and 16Mng aging impact test.
This standard was proposed by the China Iron and Steel Industry Association.
This standard is under the jurisdiction of the National Steel Standardisation Technical
Committee.
The main drafting organisations of this standard included Chongqin Iron and Steel Co. Ltd, the
Standard Research Institute of Metallurgy Industry Information, Angang Steel Co. Ltd, General
Mechanical Engineering Company of China, Wuhan Steel (Group) Co. Ltd, Jinan Steel Co. Ltd
and the China Special Equipment Institute and Research College.
The main drafters of this standard were Li Hong, Wang Xiaohu, Qin Xiaozhong, Tang Yifan, Du
Dasong, Piao Zhimin, Li Shurui and Zhang Aimin.
The standard supersedes the following previously issued versions:
-
GB 713-1963, GB 713-1972, GB 713-1986 and GB 713-1997;
GB 6654-1996.
2
GB 713 -XXXX
Steel plates for boilers and pressure vessels
1 Scope
This standard specifies the dimensions, shape, technical requirements, test methods, inspection rules, packaging,
marking and quality certification, etc. of steel plates for boilers and pressure vessels.
The standard applies to steel plates with a thickness ranging from 3 mm to 200 mm for boilers and their accessories
and pressurised components in pressure vessels at normal temperature.
2 Normative References
The provisions of the following documents become provisions of this standard after being referenced. For dated
reference documents, all later amendments (excluding corrigenda) and versions do not apply to this standard; however,
any parties that come to an agreement under this standard are encouraged to consider adopting the latest versions of
these documents. For undated reference documents, the latest versions apply to this standard.
GB/T 222 Permissible tolerances for the chemical composition of steel products
GB/T 223.3 Methods for chemical analysis of iron, steel and alloy – The diantipyryl methane phosphomolybdate
gravimetric method for the determination of phosphorus content
GB/T 223.10 Methods for chemical analysis of iron, steel and alloy – The cupferron separation-chrome azurol S
photometric method for the determination of aluminium content
GB/T 223.11 Methods for chemical analysis of iron, steel and alloy – The ammonium persulphate oxidation
volumetric method for the determination of chromium content
GB/T 223.14 Methods for chemical analysis of iron, steel and alloy – The N-benzoy-N-phenylhydroxylamine
extraction photometric method for the determination of vanadium content
GB/T 223.17 Methods for chemical analysis of iron, steel and alloy – The diantipyrylmethane photometric method for
the determination of titanium content
GB/T 223.18 Methods for chemical analysis of iron, steel and alloy – The sodium thiosulphate separation iodimetric
method for the determination of copper content
GB/T 223.23 Methods for chemical analysis of iron, steel and alloy – The dimethylglyoxime spectrophotometric
method for the determination of nickel content
GB/T 223.26 Methods for chemical analysis of iron, steel and alloy – The thiocyanate direct photometric method for
the determination of molybdenum content
GB/T 223.27 Methods for chemical analysis of iron, steel and alloy – The thiocyanate-butyl acetate extraction
spectrophotometric method for the determination of molybdenum content
GB/T 223.40 Iron, steel and alloy – Determination of niobium content by the sulphochlorophenol S
spectrophotometric method
GB/T 223.60 Methods for chemical analysis of iron, steel and alloy – The perchloric acid dehydration gravimetric
method for the determination of silicon content
GB/T 223.63 Methods for chemical analysis of iron, steel and alloy – The sodium (potassium) periodate photometric
method for the determination of manganese content
GB/T 223.68 Methods for chemical analysis of iron, steel and alloy – The potassium iodate titration method after
combustion in the pipe furnace for the determination of sulphur content
GB/T 223.69 Methods for chemical analysis of iron, steel and alloy – The gas-volumetric method after combustion in
the pipe furnace for the determination of carbon content
GB/T 223.76 Methods for chemical analysis of iron, steel and alloy – The flame atomic absorption spectrometric
method for the determination of vanadium content (GB/T 223.76-1994, eqv ISO 9647:1989)
GB/T 228 Metallic materials – Tensile testing at ambient temperature (GB/T 228-2002, eqv ISO 6892: 1998)
GB/T 229 Metallic materials – Charpy notch impact test
GB/T 232 Metallic materials – Bend test (GB/T 232-1999, eqv ISO 7438: 1985)
GB/T 247 General rules of acceptance, packaging, marking and certification for steel plates (sheets) and strips
GB/T 709 Dimensions, shape, weight and tolerances for hot-rolled steel plates and sheets
GB/T 2970 Thicker steel plates – Method for ultrasonic inspection
GB/T 2975 Steel and steel products – Location and preparation of test pieces for mechanical testing (GB/T 2975-1998,
eqv ISO 377: 1997)
GB/T 4336 Standard test method for spark discharge atomic emission spectrometric analysis of carbon and low-alloy
steel (routine method)
GB/T 4338 Metallic materials – Tensile testing at elevated temperatures (GB/T 4338-2007, ISO)
GB/T 5313 Steel plate with through-thickness characteristics (GB/T 5313-1985, eqv ISO 7778: 1983)
GB/T 6803 Standard method for conducting drop-weight tests to determine the inductility transition temperature of
ferrite steels
3
GB 713 -XXXX
GB/T 17505 Steel and steel products – general technical delivery requirements (GB/T 17505-1998, eqv ISO 404:
1992)
GB/T 20066 Steel and iron – Sampling and preparation of samples for the determination of chemical composition
YB/T 081 Rule for rounding off of numerical values and judgement of testing values for technical standards in
metallurgy
JB/T 4730.3 Non-damaging test for equipment under pressure
3 Order Content
Order contracts or order forms produced in line with this standard must include the following contents:
a) Standard serial number;
b) Name of the product;
c) Code;
d) Dimensions;
e) Delivery condition;
f) Weight;
g) Special technical requirements (such as ultrasonic testing, improving impact properties).
4 Formation of Code
Carbon steel and low alloy and high strength steel are coded with their yielding strength and the initials Q for yielding
and R for vessel in the Chinese spelling, for example Q245R.
Molybdenum steel and chromium-molybdenum steel are coded with the average carbon content and the initials of the
alloy element and R for vessel in the Chinese spelling, for example 15CrMoR.
5 Dimensions, shape, weight and tolerance
5.1 The dimensions, shape, weight and tolerance of the steel plates should meet the requirements of GB/T 709.
5.2 The thickness tolerance should conform to the B category tolerance of GB/T 709. According to the buyer’s
requirements and the agreement between the buyer and the seller, steel plates with a reduced lower tolerance on
the same tolerance can be supplied.
5.3 The steel plates are delivered in their theoretical weight. The thickness used for the theoretical weight calculation
is the average thickness of the maximum allowed thickness and the minimum allowed thickness of the steel
plates. The density of steel plates is taken as 7.85 g/cm3.
6 Technical requirements
6.1 Code and chemical composition
6.1.1
The code and chemical composition (melting analysis) of the steel plates should conform to the requirements
in Table 1.
6.1.1.1 The carbon upper limit can be raised to 0.22% for Q345R steel plates with a thickness greater than 60 mm.
6.1.1.2 The residue of chrome, nickel and copper is less than 0.30% each, the residue of molybdenum is less than
0.080% and the total content of these elements is less than 0.70% with the seller’s guarantee without the need
for further analysis.
6.1.1.3 Small traces of niobium, vanadium and titanium are permissible in Q245R, Q345R and Q370R steel, the
content of them should be listed in the quality certificate and the total amount of the above mentioned 3
elements should not exceed 0.05%, 0.10% and 0.12% respectively.
6.1.1.4 The P content can be ≤ 0.015% and the S content can be ≤ 0.005% for Q345R and Q370R steel, and the P
content can be ≤ 0.012% for 14Cr1MoR and 12Cr2Mo1R steel according to the buyer’s requirements and the
agreement between the buyer and the seller.
6.1.1.5 According to the buyer’s requirements and the agreement between the buyer and the seller the carbon
equivalent can be specified for Q245R, Q345R and Q370R steel with a value agreed by both sides. The
carbon equivalent is calculated by the formula (1):
CE (%) = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15 .............. (1)
6.1.1.6 The Alt content can be determined by measuring the acid dissolved aluminium and the Als content for the test
should not be lower than 0.015%.
6.1.2
The permitted variations in the chemical content of the finished steel plates should conform to the
requirements of GB/T 222.
4
GB 713 -XXXX
6.2 Manufacturing methods
6.2.1
The steel is smelted using an oxygen converter or electric furnace.
6.2.2
The compression ratio of the continuous casting pre-form is no less than 3.
6.3 Delivery conditions
6.3.1
The delivery conditions of steel plates should conform to the requirements in Table 2.
6.3.2
The tempering temperature for 18MnMoNbR, 13MnNiMoR, 15CrMoR and 14Cr1MoR steel should be no
lower than 620ºC; the tempering temperature for 12Cr2Mo1R and 12Cr1MoVR steel should be no lower than
680ºC.
6.3.3
Subject to agreement by both sides, 18MnMoNbR, 13MnNiMoR, 15CrMoR, 14Cr1MoR, 12Cr2Mo1R and
12Cr1MoVR steel plates with a thickness greater than 60 mm can be delivered either annealed or tempered.
The test samples of these coded steel plates should be heat-treated under delivery conditions according to
Table 2 and their performance should meet the requirements of Table 2. The size of the samples should be no
less than 3a X a X 3a (a is the thickness of the plate).
6.3.4
Subject to agreement by both sides, chrome molybdenum steel plates can be delivered having undergone
speeded-up tempering after normalisation.
6.3.5
The steel plates should be delivered with shear-cut or flame-cut edges. Where the available equipment
imposes limitations, steel plates may be delivered with raw edges if this has been agreed by both sides and
noted in the contract.
6.4 Mechanics and process performance
6.4.1
The results of the tensile test, Charpy (V-type notch) impact test and bending test should conform to the
requirements of Table 2. Steel plates with a thickness greater than 60 mm can be exempted from the bending
test requirement, if this has been agreed by both sides and noted in the contract.
6.4.1.1 According to the buyer’s requirements and the agreement between the buyer and seller, an impact test at
-20ºC can replace the impact test at 0ºC in Table 2 and its impact value should meet the requirements of
Table 2.
6.4.1.2 The value of the Charpy (V-type notch) impact test is taken from the average of three samples and one value
from the three samples may be lower than the value specified in Table 2 but no lower than 70% of said value.
6.4.1.3 The auxiliary test sample should be used for steel plates with a thickness of less than 12 mm during the
Charpy (V-type notch) impact test. The size of the auxiliary sample is 10 mm X 7.5 mm X 55 mm for steel
plates with a thickness of >8 mm to 16-36
Q245R
400-520
235
25
390-510
205
>100-150
380-500
185
3-16
510-640
345
>16-36
500-630
325
>36-60
490-620
315
>60-100
490-620
305
>100-150
480-610
285
>150-200
470-600
265
Normalisation
>16-36
>36-60
30-60
18MnMoNbR
d=2a
21
520-620
570-720
30-100
13MnNiMoR
>100-150
6-60
14Cr1MoR
12Cr2Mo1R
12Cr1MoVR
a
Normalisation
plus
Tempering
d=3a
20
d=2a
20
-20
34
d=3a
340
400
17
390
570-720
34
370
360
>60-100
15CrMoR
d=2a
0
530-630
31
24
Q345R
Q370R
180º
d=2a
d=1.5a
0
225
>60-100
10-16
V-Type
Impact
Work
AKV, J
no less
than
245
>36-60
Heat Rolling,
Controlled
Rolling or
Normalisation
Bending
Test
Impact Test
390
0
41
d=3a
18
0
41
d=3a
19
20
31
d=3a
34
d=3a
380
450-590
>60-100
295
275
>100-150
440-580
255
6-100
520-680
310
>100-150
510-670
300
6-150
520-680
310
6-60
440-590
245
>60-100
430-580
235
19
20
19
20
34
d=3a
19
20
34
d=3a
– The yielding strength can be Rp0.2, if the yielding is not noticeable.
7
GB 713 -XXXX
Table 3 – High Temperature Mechanical Performance
Test Temperature ºC
Code
Thickness
mm
200
250
300
350
400
450
500
Yielding Strength aReL or Rp0.2, N/mm2, not less than
>20-36
186
167
153
139
129
121
>36-60
178
161
147
133
123
116
Q245R
Q345R
Q370R
18MnMoNbR
13MnNiMoR
15CrMoR
>60-100
164
147
135
123
113
106
>100-150
150
135
120
110
105
95
>20-36
255
235
215
200
190
180
>36-60
240
220
200
185
175
165
>60-100
225
205
185
175
165
155
>100-150
220
200
180
170
160
150
>150-200
215
195
175
165
155
145
>20-36
290
275
260
245
230
>36-60
280
270
255
240
225
30-60
360
355
350
340
310
275
>60-100
355
350
345
335
305
270
30-100
355
350
345
335
305
>100-150
345
340
335
325
300
>20-60
240
225
210
200
189
179
174
>60-100
220
210
196
186
176
167
162
>100-150
210
199
185
175
165
156
150
14Cr1MoR
>20-150
255
245
230
220
210
195
176
12Cr2Mo1R
>20-150
260
255
250
245
240
230
215
12Cr1MoVR
>20-100
200
190
176
167
157
150
142
a
– The yielding strength can take Rp0.2, if the yielding is not noticeable.
7
Test Method
7.1 The test items, sample numbers, sampling methods and test methods for each batch of steel plate
should conform to the requirements of Table 4.
Table 4 – Test Item, Sample Number and Test Method
Sampling
Direction
Serial Number
Test Item
Sample Number
Sampling Method
1
Chemical Content
1 per furnace
GB/T 20066
2
Tensile Test
1
GB/T 2975
3
Z Direction
Tensile
3
GB/T 5313
4
Bending Test
1
GB/T 2975
Transverse
GB/T 232
5
Impact Test
3
GB/T 2975
Transverse
GB/T 229
6
High Temperature
Tensile
1 per furnace
GB/T 2975
Transverse
GB/T 4338
7
Drop-weight Test
GB/T 6803
8
Ultrasonic Test
Each Sheet
9
Dimension, Shape
Each Sheet
10
Furnace
Each Sheet
Test Method
GB/T 223 or
GB/T 4336
Transverse
GB/T 228
GB/T 5313
GB/T 6803
GB/T 2970 or
JB/T 4730.3
Measuring
instrument with
required accuracy
Visual Check
8
GB 713 -XXXX
8. Inspection Rules
8.1 The quality of steel plates should be inspected and accepted by the quality control department of
the supplier.
8.2 The steel plates should be inspected in batches. Each batch is made up of steel plates with the
same code, from the same furnace, with the same thickness, produced using the same rolling or
heat treatment method and the weight of each batch is less than 30 tons.
Steel plate factories with a long, stable production quality history after submitting the application
with the final product inspection data, and having been approved by the national special
equipment safety inspection and supervision authority, can deliver goods according to the
approved batch extension.
8.3 According to the buyer’s requirements and the agreement between the buyer and the seller the
mechanical performance test on the pre-forming rolling can be carried out on steel plates with a
thickness greater than 16 mm.
8.4 The sampling position for the mechanical performance test is taken according to GB/T 2975. The
axis of the impact test sample should be at a quarter of the plate’s thickness. According to the
buyer’s requirements and the agreement between the buyer and the seller the axis of the impact
test sample may be at half of the plate’s thickness.
8.5 If the Charpy (V-type notch) test result does not meet the requirements of 6.4.1.2, another three
samples from the same steel plate (or the same pre-formed product) could be taken for a repeat
test. The average value of these six samples from the first and second groups should be no lower
than the specified value but two of them may be lower than the specified value on condition that
only one of these two is 70% lower than the specified value.
8.6 Other repeat tests and their method of determination are carried out according to the relevant
provisions of GB/T 17505.
9
Packaging, Marking and Quality Certification
The packaging, marking and quality certification of steel plates should conform to the
requirements of GB/T 247.
9
GB 713 -XXXX
Appendix A
(Information appendix)
Code Correlation Table of New and Old Standards
The code correlation between GB 713-200X with GB 713-1997 and GB 6654-1996
(including corrigenda Nos 1 and 2) is as follows:
GB 713-200X
Q245R
Q345R
Q370R
18MnMoNbR
13MnNiMoR
15CrMoR
12Cr1MoVR
14Cr1MoR
12Cr2Mo1R
GB 713-1997
20g
16Mng, 19Mng
13MnNiCrMoNbg
15CrMog
12Cr1MoVg
GB 6654-1996
20R
16MnR
15MnNbR
18MnMoNbR
13MnNiMoNbR
15CrMoR
10